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| author | Alan Mishchenko <alanmi@berkeley.edu> | 2015-09-23 16:04:06 -0700 |
|---|---|---|
| committer | Alan Mishchenko <alanmi@berkeley.edu> | 2015-09-23 16:04:06 -0700 |
| commit | a84c8174e73882f0cdd6433ca27b8222e87dbaa2 (patch) | |
| tree | 60f0ecc552d84366b3971379051b4fbc1d5b1db4 /src/base/cba | |
| parent | 19a4bb930edcfc7910388bb08fd86482b9dd35e7 (diff) | |
| download | abc-a84c8174e73882f0cdd6433ca27b8222e87dbaa2.tar.gz abc-a84c8174e73882f0cdd6433ca27b8222e87dbaa2.tar.bz2 abc-a84c8174e73882f0cdd6433ca27b8222e87dbaa2.zip | |
Improving bit-blasting of full-adder.
Diffstat (limited to 'src/base/cba')
| -rw-r--r-- | src/base/cba/cbaBlast.c | 24 |
1 files changed, 19 insertions, 5 deletions
diff --git a/src/base/cba/cbaBlast.c b/src/base/cba/cbaBlast.c index b14b0bcd..322d4372 100644 --- a/src/base/cba/cbaBlast.c +++ b/src/base/cba/cbaBlast.c @@ -295,11 +295,25 @@ int Cba_BlastLessSigned( Gia_Man_t * pNew, int * pArg0, int * pArg1, int nBits ) } void Cba_BlastFullAdder( Gia_Man_t * pNew, int a, int b, int c, int * pc, int * ps ) { - int Xor = Gia_ManHashXor(pNew, a, b); - int And1 = Gia_ManHashAnd(pNew, a, b); - int And2 = Gia_ManHashAnd(pNew, c, Xor); - *ps = Gia_ManHashXor(pNew, c, Xor); - *pc = Gia_ManHashOr (pNew, And1, And2); + int fUseXor = 0; + if ( fUseXor ) + { + int Xor = Gia_ManHashXor(pNew, a, b); + int And1 = Gia_ManHashAnd(pNew, a, b); + int And2 = Gia_ManHashAnd(pNew, c, Xor); + *ps = Gia_ManHashXor(pNew, c, Xor); + *pc = Gia_ManHashOr (pNew, And1, And2); + } + else + { + int And1 = Gia_ManHashAnd(pNew, a, b); + int And1_= Gia_ManHashAnd(pNew, Abc_LitNot(a), Abc_LitNot(b)); + int Xor = Abc_LitNot(Gia_ManHashOr(pNew, And1, And1_)); + int And2 = Gia_ManHashAnd(pNew, c, Xor); + int And2_= Gia_ManHashAnd(pNew, Abc_LitNot(c), Abc_LitNot(Xor)); + *ps = Abc_LitNot(Gia_ManHashOr(pNew, And2, And2_)); + *pc = Gia_ManHashOr (pNew, And1, And2); + } } int Cba_BlastAdder( Gia_Man_t * pNew, int Carry, int * pAdd0, int * pAdd1, int nBits ) // result is in pAdd0 { |